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Study of resonant laser ionization in the REGLIS low energy branch of the S3 spectrometer at SPIRAL2-GANIL

Experimental nuclear physics and instrumentation

The REGLIS (Rare Elements in-Gas Laser Ion Source and Spectroscopy) device will be installed at the Equipex project S3 (Super Separator Spectrometer), currently under construction as part of the SPIRAL2 facility at the GANIL (Grand Accélérateur National d’Ions Lourds) laboratory in Caen, France. REGLIS will be a source for the production of new and pure radioactive ion beams at low energy as well as a spectroscopic tool to measure nuclear hyperfine interactions. It consists of a gas cell in which the heavy ion beam coming from the S3 spectrometer will be stopped and neutralized, coupled to a laser system that assures a selective re-ionization of the atoms of interest. Owing to the unique combination of such device with radioactive heavy ion beams from S3, a new area of unknown isotopes at unusual isospin will become accessible. This device has been very recently selected by the French National Agency for the funding of the gas cell set up and will benefit from the international expertise of the group from KU Leuven, who obtained an ERC grant for their contribution to the project. REGLIS will provide the Equipex project S3 with a unique tool and will become a world leading facility in laser spectroscopy.

The final goal of this project is to obtain nuclear and atomic physics information of the heaviest elements in nature. Nuclear properties will focus on charge radii, magnetic and quadrupole moments and spins while atomic properties deal with energies and rates, of so far unknown transitions, ionization potentials, hyperfine parameters, isotope/isomer shifts and atomic F and MSMS factors. These data will be confronted with state-of-the-art nuclear and atomic calculations.

The purpose of the Master2 Internship position is to study the possibility to integrate an existing all solid state Titanium:Sapphire laser system in the REGLIS set up and to improve and develop the laser system in order to fulfill the requirements for the spectroscopic studies at REGLIS. The candidate will design, build and test a tracking system for the scan of frequency doubled light by synchronizing a remote controlled grating laser with a motorized SHG crystal. The candidate will also work off-line to develop and evaluate ionization schemes for elements requested at the low energy branch of S3.

This project is supported by a large international collaboration (KU Leuven, Mainz University, TRIUMF laboratory, ISOLDE at CERN) and the candidate will have the opportunity to benefit from the expertise of the partners in this network.

Expected skills: Good knowledge in nuclear and atomic physics, photonics, ion optics, instrumentation, and computing are desirable

This internship leads to a PhD thesis.

 


Contact:  Nathalie LECESNE

GANIL, BP 5027, F-14 076 Caen cedex 05


Phone: +33 (0)2 31 45 44 72

 Fax: +33 (0)2 31 45 44 21

e-mail: lecesne_at_ganil.fr


 

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